Looking for the cnc plasma cutter for metal fabrication but have no idea of which is the best plasma cutter available? Check and review the buying guide on 2021 best CNC plasma cutter for sale. As a professional manufacturer & supplier, we can provide different kinds of affordable cnc plasma cutter machines within your budget for metal fabricators, metalworkers, beginners and hobbyists, to meet your working requirements for fast & precision metal fabrication indifferent fields.
What is a cnc plasma cutter?
cnc plasma cutter is a kind of CNC machine tool which controls the movement of precision machinery through computer and servo system. It uses the heat of high-temperature plasma arc to melt (and evaporate) the metal at the workpiece incision, and uses the momentum of high-speed plasma to eliminate the molten metal to form the incision, so as to achieve fast and accurate cutting of any graphics.
plasma cutter cnc machine integrates the advantages of high-speed plasma and high-speed plasma Numerical control technology, computer software, hardware technology, plasma cutting technology, precision machinery technology in one of the high-tech.
Because of its high speed, high precision and high automation, NC plasma cutting replaces the complicated and backward manual and mechanical operation. Because of its relatively small investment, simple maintenance and low operation cost. It is widely used in all kinds of metal processing industry.
How Does A Plasma Cutter Work?
There are four states of matter known to mankind, namely solid state, liquid state, gas state, and plasma state. When the gas reaches an extremely high temperature, it enters a plasma state, the energy begins to completely separate the molecules, and the atoms begin to split. The usual atoms are composed of nuclei, neutrons and neutrons, and electrons surrounding the nucleus. In the plasma state, electrons are split from atoms.
Once the thermal energy frees the electron from the atom, the electron begins to move at high speed. The electron is negatively charged, and the remaining nucleus is positively charged. These positively charged nuclei are called ions.
When the gas is ionized, the high-speed electrons collide with other electrons or ions, which will release a huge amount of energy. It is these energies that make the plasma state have special properties. When the clustered plasma is used for cutting, the metal is locally melted (partially vaporized) and the molten metal is blown away with a high-speed airflow at the same time, forming a narrow slit.
Not only the cutting speed is fast, but the slit is narrow, and the slit is narrow. It is flat, with little thermal influence, and little deformation of the workpiece. It solves the problem that many materials cannot be cut by flame.
Advantages of cnc plasma cutter for sale
As a new type of cnc cutting machine, cnc plasma cutter machine has the characteristics that the traditional cutting methods can not be compared:
1).Wide cutting application
can cut nearly all metal materials, especially for non-ferrous metals (stainless steel, aluminum, copper, titanium, nickel) the cutting effect is better;
2). Good cutting quality and low labor cost
Plasma cutting machine has the characteristics of non-contact processing which does not damage the surface and causes no deformation for the workpiece, the cutting quality is excellent with no burr, further polish process is not necessary and thus is not required, saving much labor intensity of workers.
3). Save the investment of mould and reduce the production cost
Cnc Plasma cutting machine can directly cut all kinds of metal workpieces without mold, no mold consumption is thus produced, no need to repair and replace the mold, reducing a lot of mold cost and production costs, especially suitable for the processing of large products.
4). High precision, effectively improve productivity
CNC Plasma cutting process has the characteristics of accuracy, flexibility and high efficiency, which can effectively process all kinds of complex parts. Just make the good cutting graphics and import them into the control system, you can set the size for cutting which helps to directly shorten the product processing and manufacturing cycle, and effectively improve labor productivity.
5). Fast cutting speed and optimized working environment
cnc plasma cutter machine has high cutting speed with low noise and no dust, it will not produce harmful chemicals to the human body and the environment, ensuring the clean and tidy production site and reducing the further investment and pollution.
6). Low maintenance cost and high cost performance
The maintenance of mechanical products is very expensive, the performance of cnc plasma cutting machine is stable and durable, it is not easy to be damaged and thus has a great advantage in the late maintenance cost.
What Are Plasma CNC Cutter Used For?
CNC plasma machine can be used for cutting works of a variety of metal materials, such as carbon steel, stainless steel, alloy steel, copper, aluminum, galvanized sheet and other non-ferrous metals, and thus is widely applied for various industries, including:
* Automobile manufacturing,
* Machinery manufacturing
* Pressure vessels manufacturing
* Steel structure manufacturing
* Metal processing
* Ventilation and refrigeration manufacturing
* Elevator manufacturing
* Arts and Crafts
How Many Types of Plasma Cutters?
Cnc plasma cutter machines can be divided into different types in terms of machine structure, including:
1).Portable CNC Plasma Kits
The machine is portable, easy to setup, compact in structure, small in space and low in manufacturing cost. However, due to the limitation of the cantilever structure, the stress conditions are poor, the transverse deformation is prone to occur, the transverse cutting width is limited, and the rigidity is poor during high-speed cutting.
2).CNC Plasma Table Kits
The cutting part and the machine are integrated, which is convenient to move in place, but the movement range of the cutting torch is relatively small, and the cutting width is subject to certain restrictions. The most common types of CNC plasma table kits include 4×4 plasma tables, 4×8 plasma tables, 5×10 plasma tables and 6×12 plasma tables in feet, some user may call the CNC plasma cutting table kits as 48″ x 48″ types, 48″ x 96″ types, 60″ x 120″ types in inches, some user may call the table kits as 1212 types, 1325 types, 1530 types, 2040 types in millimeter (mm).
3).Gantry CNC Plasma Kits
The gantry-type supporting method is bidirectionally supported, the force is more uniform, the equipment has good rigidity, and can achieve a large lateral span, usually up to 3 to 10m. However, the equipment installation requirements are high, the structure is relatively large, and it takes up more plant area. The driving mode is divided into unilateral driving and bilateral driving. Unilateral drive and bilateral drive each have their own characteristics and applications. The unilateral drive avoids the high-precision synchronous control and complicated structure of the bilateral drive. However, due to the offset of the center of mass and the driving force does not pass through the center of mass, asymmetric inertial force will be generated during operation, which is prone to vibration, deformation and tilt. Therefore, it can only be used in a small span. The double-sided drive structure is relatively complicated and requires high-precision synchronous control on both sides, which can be used for a larger span and more stable movement.
4). CNC plasma tube cutter machine
cnc plasma tube cutter is specially used for cutting works of different profiles, including round pipes, square/rectangular tubes, including channel steel, angle steel, U steel, beam profile, etc. This machine can carry out 2D and 3D bevel cutting on on main & brand pipes
The cnc plasma pipe cutter is equipped with advanced control system & nesting software which makes the machine an ideal solution for plasma cutting tube in industrial fabrication, especially steel structure, ship-building, machinery manufacture, etc.
How to choose the best plasma cutter
Actually, when purchasing CNC plasma machine, we need to know well of the actual cutting requirements, such as material, thickness, working size, specific cutting requirements, etc, so as to make the best decision. Here are some tips on how to choose the right machine, hoping it helps when you are new in the field:
1.Material to cut
CNC plasma cutter is mainly used in different cutting fields such as plasma cutting aluminium, plasma cutting copper, plasma cutting steel, plasma cutting brass,etc. If you want to cut stainless steel, you will have to choose plasma cutting machine! Otherwise, the processing effect can not be achieved with oxy-fuel cutting.
At the same time, the maximum cutting thickness of the same plasma power source for different materials is different. When the material to be cut changes, the maximum cutting thickness will also change. The descending order is: stainless steel, carbon steel, aluminum, brass, red copper, etc. Therefore, this point should be taken into account when selecting the actual type of cutting cutting machine.
Besides, the cutting material needs to be clear so as to determine which cutting method to take, plasma cutting or flame cutting.
2.Cutting thickness of plasma cutter cnc machine
Cutting thickness, as the most important performance index, should be special paid attention to. When selecting the actual machine, users should make clear the cutting thickness of each material, which is extremely important for the future working performance and cost control.
1).The cutting thickness marked on document and instructions of plasma cutting machine manufacturer is generally the maximum cutting thickness, that is, the maximum thickness that the material can be cut off, but the speed often can not meet the needs of normal batch cutting.
When selecting the model of industrial used cnc plasma cutter, a certain amount should be added to the cutting thickness required for processing. It is suggested that 1.4 times of the required cutting thickness is the reference amount, eg, the plate thickness you often cut is 25 mm, 25 mm * 1.4 = 35 mm. If you choose the model with the cutting capacity of 35 mm or more, it will not only meet the needs of your cutting thickness, but also ensure a certain cutting speed.
2).Plasma cutting has advantages in thin sheet metal, with higher cutting precision and faster cutting speed, especially when it is used for cutting plates less than 20 mm. But for thick plates, the required plasma power source will be larger, so the purchase cost will be increased greatly.
If the requirements of cutting quality for thick plate are not very strict, flame(oxy-fuel) cutting has more advantages and thus can be a better choice, because the flame cutting has bigger cutting thickness and smaller running cost.
3).No matter what kind of air plasma cutting machine, it has its own most suitable cutting size and range. Generally, low-power plasma source is suitable for cutting of thin plates. If the plasma power source is too large, the cutting performance will be degraded and thus is not suitable for thin plates! At present, domestic plasma power sources of 40-60a are mostly taken for steel plates less than 2mm.
Plate size or working size is another factor needs to be taken into consideration, which directly determines the travel stroke and model of CNC plasma cutter.
The plate length mainly determines the length of longitudinal guide rail and the effective longitudinal cutting distance of cnc plasma cutter for sale, and the width mainly determines the transverse moving distance(plate width) of the cutting nozzle of cnc plasma cutting machine. For example, if you want to cut 10 mm stainless steel with a size of 2.5 x 6 meters, you will generally be recommend gantry CNC plasma cutting machine of 4×15 meters or 4×15 meters series.
The quality of CNC plasma cutting machine is the problem that customers most concern. To solve this problem, customers need to carefully understand the production process of the machine, including machining accuracy of machine bed, quality of main parts, assembly process, etc. If conditions permit, customers are recommended a personal visit to manufacturer factory to check the quality & function of cnc plasma machine.
1). Cutting speed of CNC plasma cutting equipment
Cutting speed directly determines the working efficiency of the machine and ultimately affects the profit of the enterprise. Main factors that determine the cutting speed of CNC plasma cutting machine are as follows:
*Model of plasma power source
Generally it refers to the output current of plasma power source, such as 40a, 60A, 100A, 200A, etc. The cutting current is different according to the different powers and the cutting speed is also different;
*Material of workpiece
The cutting speed is different for different materials. Among the common materials, the cutting speed of carbon steel & stainless steel are faster, cutting speed of cast iron is slightly slower, followed by aluminum, the slowest one is copper, because copper and aluminum are more difficult to cut and the cutting thickness of copper and aluminum, even by plasma power source of the same power, is much smaller than that of stainless steel and carbon steel.
*Field input voltage
Generally, the power supply voltage of the factory is 380V AC. due to the different conditions of each factory, However, the voltage fluctuates between 365v and 410v (of course, the difference is even greater in some places), so the input voltage is also a factor affecting the cutting speed.
The main advantage of CNC cutting machine is to improve the cutting efficiency and cutting accuracy. For users, the more concerned problem is how to improve the cutting accuracy of CNC cutting machine. The factors affecting the cutting accuracy are as follows:
*Plasma power source must have enough no-load voltage to strike arc and keep plasma arc from extinguishing.
*No-load voltage and arc column voltage
Increasing the gas flow can not only increase the voltage of arc column but also strengthen the tightening effect on the arc column, which makes the plasma arc energy more concentrated and the radiation force stronger, thus improving the cutting speed and quality.
The best cutting speed range can be selected according to the equipment instructions or determined by experiments. Due to the differences of materials, thickness, melting point, thermal conductivity and surface tension after melting, the cutting speed also changes accordingly.
Too large or too small gas flow will affect cutting quality and service life of plasma cutter consumables. If the gas flow is too large, the arc column will be shortened and the heat loss will be too large, the cutting ability will be weakened until the cutting can not be carried out normally;
If the gas flow is too small, the arc column energy will be insufficient, the cutting ability will be reduced, the steel plate hanging will increase, and the consumables will be blocked, affecting the quality of consumables.
The cutting current should be adjusted according to the actual situation. With the increase of cutting current, arc energy and cutting ability will increase too, the cutting speed will also increase accordingly; with the increase of cutting current, the diameter of arc will increase which make the incision become wider.
If the cutting current is too big, the thermal load of nozzle will increase, then the nozzle will be damaged prematurely and the cutting quality will decrease, even the normal cutting cannot be carried out.
*Precision and stability of torch height controller
The high precision and stability of torch height controller has a great influence on the quality of plasma cutting.
5.cnc plasma cutter price
This is a key problem. How to choose the best plasma cutter? It is unrealistic and undesirable for customers to take chances and spend low prices to buy good plasma cutters. The quality are relatively low, running cost will increase in the future cutting process. Once problems occur, the production efficiency will be seriously affected.
At present, cnc plasma cutter for sale are mainly divided into domestic and imported ones, in which the domestic ones are divided into low, medium and high grades, the cnc plasma cutting machine price are generally acceptable! And the price of import ones are almost several times higher.
In general, compared with cnc plasma cutter of the same specifications from domestic brands, the cutting effect of imported ones is slightly better, but the price and later running cost are very high!
Therefore, it is recommended that customers carefully understand their own work needs and make a reasonable budget before purchasing machines, and then choose the best plasma cutter that are suitable for their own work requirements and within the budget to avoid inferior products and unnecessary costs.
6.After sales service
CNC plasma cutting machine complicated machine unit composed of different functional modules and components, no part can be guaranteed to be perfect and machine will fail to work from time to time, problems need to be solved to customers in time, so after-sales service is very important.